Piston assembly



FIG. 1 is a front perspective view of the piston assembly shown in a first position;

FIG. 2 is a top perspective view of the piston assembly shown in a first position;

FIG. 3 is a front elevation view of the piston assembly shown in a first position, with the rear elevation view being a mirror image of the front elevation view;

FIG. 4 is a right elevation view of the piston assembly shown in a first position;

FIG. 5 is a left elevation view of the piston assembly shown in a first position;

FIG. 6 is a top plan view of the piston assembly shown in a first position;

FIG. 7 is a bottom plan view of the piston assembly shown in a first position; and,

FIG. 8 is a front perspective view of the piston assembly shown in a second position.

The broken line in FIGS. 1, 3–5, 7, and 8 which define the bounds of the claimed design form no part thereof. 

The ornamental design for a piston assembly, as shown and described. 